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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560adef237a1bdfa0d4670471530e1f9b63df68cc216a154d2d73c831fa9f28b' 
  AND token = 'pJ806+aCO/SFOXnFtVt4F3mwOi2edVNIVZn6dLov7HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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