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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a40cb94750de69d4d46d0169a20a12f6c1fc95dad82d107c81aaf821cf3748c' 
  AND token = '2AwS1qHDkFgAXeJNIGBo6h1Kj/I7URu0y8gkgVu7gKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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