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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19c1dfd42da6a23322e78fbc4c93a891390ed3bf7e483e0299418542fa2c6421' 
  AND token = 'PVxXEiAPKQZJ2C+8Gqn1ZTJ4R2cbicTNm0CJxMD7F+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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