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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6f9770558b41319e6e51f6ae554cf7b3fda3b5317490a554f06dad33fa955c1' 
  AND token = '+TSIZJ4RYENoGs4/8SVnijtbUwyiKEyulyz3Xh5fPRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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