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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0a83adbbd55f0ed9c1b87ea65d98b133203411fd35c9ebeff04ea4bb0d045c9' 
  AND token = 'rAUM+7a1b7lJVMymjQbFWWCtAa4oqPr5fqbYD6Iz5LM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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