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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58bdb31ccd8be6d4a0a9b4a913c37d3ed8608637f729a6980ad8ff8082d8146d' 
  AND token = 'WgM/CDv0A/9XL1Bs/gsZvwgkxPJnI1nbqDW8NIMrJaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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