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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068af28340b829fa2ce4c20f0d11f3786db321d4a5708aa9fa1c884a50e29af7' 
  AND token = 'vtdwghK4udRfIkNf/ZgGTenLr/Lh3WNT7ksSf1cZMYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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