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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46be86c48e50f6fde1de888f7950d74bb0248ba13684678a257f18e0839b67e5' 
  AND token = 'NvEkLLN/M5KoA3OJ8FUh/BY54H9ruJigweB8iTRlu3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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