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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2996d550e050afc4353a46f75eb4d3a1d2d41a7e1d252be3aca734b085d3eea' 
  AND token = 'KNv8isAxs+Mmd6abVMLG53te0ZzAUEOyLLKgsN1kkNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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