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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41cd4550fad349bc54625bbb417e451a225b428a5bf6c3f91505d60069b709f0' 
  AND token = 'Tmjr5WPqjOz92Z+4mJKOS2VNggP/D9rsaMSJzkbRfOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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