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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a607a3df8ff6d5a4373eda5333f4b689660d313aa2e8f96fc33505dc3e94f10c' 
  AND token = '5jAOpZUF/O3/R7EH0H3CUomc8MnaMPZxtmxLL3x16oA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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