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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e150fe62c451f4a50925edbe68bab765c0d8f5d5d5ac048f40d97074eff0a01b' 
  AND token = '1NoKZoimG505zwTNv/1mqlf7ed0gEWsxWalmqeaiy/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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