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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7b70d69e3e285eed71fa1f2e979b82201b757976567c321a19b3fc0f8e5a8d1' 
  AND token = 'IbWZJ7xdnKYNUp0gNFhojPtW9aWS05EC4XwipTZmHDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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