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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4480d1428611329a7a2ffcb12abf1c46f0281e587426c54571f044e81c7594c0' 
  AND token = 'PeKeo7wXq2YfJCdEHeOyxDdOjrmNh8C7ORPCSGj257o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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