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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9632c5901f9baf6f2d5dcb63246a8b9d37dee9e4c36c7267d8f50d24c0d15a05' 
  AND token = 'H3JyjbC3hCq16nJrfXWqdu5tpJRXSQUzeVMeoskQF+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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