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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8902477d3ba61fa92ffad5547e893f94a9de2e0f8d7eb0f47c4e70852836b55e' 
  AND token = '9GHkuD8xDm5vS9VItWhIf8JCbD2Ca7pXtdN7rnkJxnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}