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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32d931590c073ee3298592786f6d9c5e98708c48ca38b6bbbbc376feb28306c' 
  AND token = 'ZJ7xPqj9+4luhtDkBNmUSS2K2+oyBJQBIu+crnAh0HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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