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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f82324cdaf2ddb39b03e3b0fb26d7286b0499524404252a4ea45b098265137' 
  AND token = '+GSwTLK3AtPavwL687SF4/YcAu133P/OjdZE9ATG8PQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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