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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04a88f345b8cb7e6d1930a77896d95558d0df94387a413a5c061559ee249653' 
  AND token = 'X9Nz3zxSdkexibPQJNun2q5k8OalIgTIeZIll0DAdms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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