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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb87c2160356c9e4e6914676cb1c92ead2e35260d3e0d915ce9da2fc0af6601' 
  AND token = 'LXV2F3TKH4qoFm6WmPSN3zRx39vOfE23ktqO5YNyeAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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