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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04c093c041416ed296466944a59be1ca2d1f5ec84fb8738503a5f8cd4b1fff0' 
  AND token = 'bD7u1v94+f8j6vGA6q5Zl3REkzzMLVtICmNyKjK6rjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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