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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea0e7e94b6bd5e3e91a045e14817735b142e556705649817f3a2acd9fa37eb9f' 
  AND token = 'kkrZmHjxTHbjvEi/wd4cZk6Mcxv1ouQJxXNuBX4eC6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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