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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199777a2a733a0f22e16514ebb8669c429733cdbb7fc23b41628d228c541021b' 
  AND token = 'RK/PBPyscKdQnBLoU0MSf7UHtcuij2gijBJAIE9XQyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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