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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70b18a4bab30d99f61bcc927d8773af0268b86faa0574090f1cab57448c02c74' 
  AND token = 'nCh9mzODbKDy/irQNCi0wApeMRp+A6u77y62swRX+oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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