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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a95626cc5ad1ac06ec2f818fa37fe83cbd64d0fa14db595dc6e21bc31addc4d' 
  AND token = 'dRX9xbTSLktmP9oWYFlnwr9mSSdiP3hNaLUmymM2KH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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