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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da23b7233c51a082f47c203bf5e7d50e62f6185c33d1870006781a97db75d060' 
  AND token = '+gkG2ApkrL/1BnGaUS4x9bw/rWRO6kM1Vhmv2kDxgBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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