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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e70f677c3d8e9c6a29bba3b79da0f35f1859a861c76620c999597163d3c5ad4' 
  AND token = 'RrW6BW/aOzasOz987x3beQKTbnsC7W2mo1JGRAWmK4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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