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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acbcf2f57b7915f607a48104434a5a147a19d742e6754e60e7db3f378d54db8f' 
  AND token = 'JtWN56jUAr5azbR1Su5fFaZbRsQQ/hP0xv6FYgEbzBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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