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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5571f632e7da44c60fd6479dce4deb7ec1a8d133a73d722aed044a975ca62d01' 
  AND token = 'Ndr6rc0lwoLMocyHqfXy/cxVVsN0GKZi4yVdbG9X6dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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