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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c80ec9339806d38782ba0f5828141ba687c79b7613efcf231b4eacbc939490' 
  AND token = '3iDbNEMMluPOduOa/5IL7U2crgD+tfe8YjEW4+0AFxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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