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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db9aa626f607b1fe33076b69b8a5d35db8e408aa310c77a990234f45de9e717' 
  AND token = 'QduFNPXAoNoCKaEzykrcAH6lO5962cbRjk6NdlaOgeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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