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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fac8d0ed1409a2b749d4d9b4b4bcf0848da4ea068143b282b5458f69b567c0e4' 
  AND token = 'wAdsGDr9CrJgfjIikjOzVpRHYa+7FEkG/CIspmoW15g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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