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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f2aa5c0e7c2987b8babb8b111ca2892c12e61fc3c355c6632c413f715b6c2b' 
  AND token = '9i7RG5TEq9i4mUyPuzlbaGzp8WBPqoL4Z5HItXCOfV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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