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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e0d26e6970b64ab738cb4c4f16e3c9f2ecbbe2d536efce29d500a18b43602c' 
  AND token = 'OSSHAtVv5TKg9XdpUB17j9VzrBpUogP5D5NuTT7gCCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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