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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1f42ba015c252775ffd5d5793dac1fe81d2b10b1cfb135f7502d4b79b360644' 
  AND token = 'ZVyI37bT0d7Es8F/J60Iy9KPt8XDl2Vf7itGklm3jcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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