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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa780acb4670e721f5af5ae9e3c13319321882f0c43dc3d8d4a2cf5efdb4d9f' 
  AND token = 'zJ84v039nZfu+rOIIyOsHBqXYQ5oUZNahnX+DPIevJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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