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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b29dbc5dff8c1068749a38493bf717484dc11b0ab15760346aa3b5d0f0221adc' 
  AND token = 'YIG1RG6KaQPIgkVKS/cr0VU1GVvbiN0ioyWI1DJwLQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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