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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55d5beae5fffa45b40f7b059711f1ee753ab1cf64f6e0ce2d70c422d1066df1b' 
  AND token = 'WK6BIv6sc/SdhFB6MjbeZJnwk0b16dV1f5kcT0xwInE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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