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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5418c3465bdc498579ff6542ab899761e8c81e7cc2723cab4aedfdad951dfa30' 
  AND token = 'rZOM8rht7ZQ6UBZ1AqifBN8u5oCR0p3S6HEURrPY4Fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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