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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6510bd2e4ab95e8d5c274465ae0154fa499e3044a9055efd89b9592c7cc480f' 
  AND token = 'q0aLugH5/lK/kl5JVX0fR2tsHw1Hi6t+JSBMn5Q2suA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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