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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2401924cd424a2595a9fd2147abea31d22bca99e24748c52fd4b660b321d91a4' 
  AND token = 'KWiZVMJkalqZNhr4OxYjPKJGecBACL+e5pZU+I8A2oI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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