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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30de686ec3c4b504917388bf6e4f1cee31106e23f8865bc8d95b0e3f809aff3' 
  AND token = '49wbAx4+KEm3ZbTFn9OhxirgzIghj26e7UB+Us2KqS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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