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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28507180ccfdf673f1777d6950ce76dc29386d3d43049d23eb146224f18cd38' 
  AND token = '9Uf2C3gbqbrSPq2N9wI5tGIwXH3VQGVYxyrbN35hd/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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