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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5e2ae5265293483c7f50ceab58d9a2fdf38e200e68f371b8db5c78586c0dfa' 
  AND token = 'qlWftYQypvb75sxE0k4lwFykFkJSo8r43zzcf9rtgMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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