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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b326f4b880a68f3836b9698ec8678220b32b4cdc35e9afb993ae6b1a47fda39b' 
  AND token = 'fIoT3bSXgr3vR/O73bayH0+z4Y9Ny3DP8to4X47RbFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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