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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38da88a0d475c331c7fe0bfb514ee7f018493079f0a03765ad65b4b398b46e37' 
  AND token = 'Uce+H4dmswRMHq4Z00noamXPvA8dzpXVeKsRFXdTfHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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