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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4b49b93bbffbc79e40f0486b5ea51123b9f0e7adcf17beb89f9a121e948e184' 
  AND token = 'wByhFWlgFOvnAk2bGWidNnwWos0sNn/Y5aJRTG+ZtJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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