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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7587693f6fa69571ed441ae230674cb71b82fd174619f5fff44e0d4777fa801c' 
  AND token = 'J8ieHQb6xuBr5DAxt0gGHzz9+z8xmLUOIEP0vFh5pnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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