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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a785433a78e3bb9b3f844356407d109f38b06b08b1c4c68c7cb8fcd4a80a00c8' 
  AND token = '7bQ4htQxqSphc/oyGIpbgLo+ZKkbMtQSEALo+awxn5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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