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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8d6496b94244a4879320a5a6bfbd37f89861d1f39ea96ae2f2ad83ad5ee87e' 
  AND token = 'H6iejf4Sm0ttVV2lvcw79u97EzJLchsX/XoDfViZFhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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