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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0febb7facef9856857de2e13fe97e7476e0a2244f1e53042864f5effe1650b6f' 
  AND token = 'l0ikOwnP+Nm6V31fgBDPKOJb19Vc+/vWBkAi/GwBf0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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