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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a7b3876a6e65c2723915f30575c63b31bef48705ef0fb5da2a7baad32e3199b' 
  AND token = 'Eut28LTSdsvXpSC+liaQq9+00PLcqXldAMlbt/zWYrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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