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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25761024f85b2d14256394e53c27b386573d17ff929aad1cfcf81277723f049d' 
  AND token = 'pGZ/42xOyz0SUw3u3nbNWilbQFK2DQy2c70Khl4Eh4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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