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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be88dc21f3675e7b42dac74e04744e94650077704e62c1308a4f663039ff49fa' 
  AND token = 'WTW55j3N20FG+vTAueO7MtKED2B7JSv3Cnpf3bhqpqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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