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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ee4e55ee65702f77efa682a9b3460217edd44a844618e0d8146fa1ef4853cb' 
  AND token = 'hN9NvRrp42O7PPQFeDqWVw8wPD5plIZuNe/ANkjp390=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00127

JSON explain

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