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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ffd4c9fb75208fc7bba925437d2e94112a4417e028625d01cc4f3e9c4c09384' 
  AND token = 'PLI3+/s9is7ZBUpW8gJ0kyEMNMFm2n5JR9MwI5nZ1k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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