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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '337e3eca8a63a0d0d693e8b8060ed71c3434e063a14f63b0d9f428db5e47696c' 
  AND token = 'FWFM7xtEvw4BH8MTXoNSCw/owAMXjoLdXTg/j7fIyzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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