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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ccdcfe4d0a8fa4bcf6d9adea050cad1103c219ad6367a2b2609ebd3ad937c1' 
  AND token = '0x4WRaSeIICaKQVKka5VMjZMPXbs/zqideTZynRJdGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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