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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f928fa72e5caf1076ecf79f0cb1ef71e4bd6d129bff9eecb67de1e7d34865ad6' 
  AND token = '9jkhWxnI9Y//cxGpf7Ze4YjRBshEKKVFy0PAhVONl4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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