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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18749efc7bad7a9065721f0fd4b37ac5cf9c2b6f6988e765ed860e06856a4843' 
  AND token = 'gSMf4Q+/DnG2QwSFummldEXRJxQhLAomSnl1N+kIO94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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