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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3755556210c0e46764c8d64a1683a7eb12a028f053cecac3943060030858ff17' 
  AND token = 'WQk81nax111cC+LktCdyRD7BmhJ62qlbMVepgRmbVTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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