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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db445cf8e266fc6265aac251348e5d886e10d81d75c0f325a3bc283ec338b95c' 
  AND token = '+KPITMg4FqIuQiD1K1py0aogl3XjVtBa1994M+ZMl+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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