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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '983d86df1caebb990f1c46fbeda1bb00e5dd0409b0b0634c91e521ec4a08d68e' 
  AND token = 'zhIell7iVQvzRotmAVIn+rfUggVKCRo/t+Vdvn1rG5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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