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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84289e55584a949c48ddcd10b7361c5dc27c4e6c7eac6f0884f23ce80a0140af' 
  AND token = '44bSW5++Sr/b84ejh4AQHVOwvtKBOF+M1Av6Y+GYzRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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