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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08bfcdfbed540a18bb2652960b619cf4b726159fde88f67e9443313686afbb69' 
  AND token = 'd27iyOY5srIRZzLVuZEi/TV97sWguI85ONc4aIC6U+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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