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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68903238a03e993d500b16e9bb429a6bc382f2426c5a1a7d007544d923b93f81' 
  AND token = 'mWK/UL1hAL+K71hRCjMWjf/by9u/ckfPftcMB1dPQHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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